FR2898171A1 - POWER TRANSMISSION BELT. - Google Patents
POWER TRANSMISSION BELT. Download PDFInfo
- Publication number
- FR2898171A1 FR2898171A1 FR0601923A FR0601923A FR2898171A1 FR 2898171 A1 FR2898171 A1 FR 2898171A1 FR 0601923 A FR0601923 A FR 0601923A FR 0601923 A FR0601923 A FR 0601923A FR 2898171 A1 FR2898171 A1 FR 2898171A1
- Authority
- FR
- France
- Prior art keywords
- film
- polyethylene
- belt according
- belt
- toothing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 8
- 239000004698 Polyethylene Substances 0.000 claims abstract description 27
- 229920000573 polyethylene Polymers 0.000 claims abstract description 24
- -1 polyethylene Polymers 0.000 claims abstract description 22
- 229920001971 elastomer Polymers 0.000 claims abstract description 12
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000005977 Ethylene Substances 0.000 claims abstract description 11
- 239000000806 elastomer Substances 0.000 claims abstract description 11
- 229920001169 thermoplastic Polymers 0.000 claims abstract description 7
- 239000004416 thermosoftening plastic Substances 0.000 claims abstract description 7
- 239000004711 α-olefin Substances 0.000 claims abstract description 7
- 229920002943 EPDM rubber Polymers 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 9
- 229920001577 copolymer Polymers 0.000 claims description 7
- 229920000098 polyolefin Polymers 0.000 claims description 7
- 229920001684 low density polyethylene Polymers 0.000 claims description 5
- 239000004702 low-density polyethylene Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 239000012815 thermoplastic material Substances 0.000 claims description 5
- 238000004073 vulcanization Methods 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 239000006229 carbon black Substances 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 claims description 3
- 229910052982 molybdenum disulfide Inorganic materials 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims description 2
- 238000004132 cross linking Methods 0.000 description 10
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 4
- 239000003431 cross linking reagent Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 150000002978 peroxides Chemical class 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 description 3
- KOMNUTZXSVSERR-UHFFFAOYSA-N 1,3,5-tris(prop-2-enyl)-1,3,5-triazinane-2,4,6-trione Chemical compound C=CCN1C(=O)N(CC=C)C(=O)N(CC=C)C1=O KOMNUTZXSVSERR-UHFFFAOYSA-N 0.000 description 2
- 239000004709 Chlorinated polyethylene Substances 0.000 description 2
- CERQOIWHTDAKMF-UHFFFAOYSA-M Methacrylate Chemical compound CC(=C)C([O-])=O CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 description 2
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 238000010382 chemical cross-linking Methods 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- HGDULKQRXBSKHL-UHFFFAOYSA-N 1,1-bis(2-methylprop-2-enoyloxy)propyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OC(CC)(OC(=O)C(C)=C)OC(=O)C(C)=C HGDULKQRXBSKHL-UHFFFAOYSA-N 0.000 description 1
- IPJGAEWUPXWFPL-UHFFFAOYSA-N 1-[3-(2,5-dioxopyrrol-1-yl)phenyl]pyrrole-2,5-dione Chemical compound O=C1C=CC(=O)N1C1=CC=CC(N2C(C=CC2=O)=O)=C1 IPJGAEWUPXWFPL-UHFFFAOYSA-N 0.000 description 1
- 229920002126 Acrylic acid copolymer Polymers 0.000 description 1
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 1
- 229920000034 Plastomer Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- OKKRPWIIYQTPQF-UHFFFAOYSA-N Trimethylolpropane trimethacrylate Chemical compound CC(=C)C(=O)OCC(CC)(COC(=O)C(C)=C)COC(=O)C(C)=C OKKRPWIIYQTPQF-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 229920006242 ethylene acrylic acid copolymer Polymers 0.000 description 1
- 229920001038 ethylene copolymer Polymers 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 229920002681 hypalon Polymers 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- ZFSLODLOARCGLH-UHFFFAOYSA-N isocyanuric acid Chemical compound OC1=NC(O)=NC(O)=N1 ZFSLODLOARCGLH-UHFFFAOYSA-N 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229920001179 medium density polyethylene Polymers 0.000 description 1
- 239000004701 medium-density polyethylene Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229920003145 methacrylic acid copolymer Polymers 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000010060 peroxide vulcanization Methods 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 229920001897 terpolymer Polymers 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 239000004636 vulcanized rubber Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
- F16G5/00—V-belts, i.e. belts of tapered cross-section
- F16G5/04—V-belts, i.e. belts of tapered cross-section made of rubber
- F16G5/06—V-belts, i.e. belts of tapered cross-section made of rubber with reinforcement bonded by the rubber
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
- F16G1/00—Driving-belts
- F16G1/06—Driving-belts made of rubber
- F16G1/08—Driving-belts made of rubber with reinforcement bonded by the rubber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
- F16G5/00—V-belts, i.e. belts of tapered cross-section
- F16G5/20—V-belts, i.e. belts of tapered cross-section with a contact surface of special shape, e.g. toothed
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Coating Of Shaped Articles Made Of Macromolecular Substances (AREA)
Abstract
L'Invention est relative à une courroie nervurée de transmission de puissance présentant une denture en élastomère à base d'élastomère éthylène alpha oléfine. Elle est caractérisée en ce que la denture et au moins en partie revêtue d'un film en matière thermoplastique au moins en partie réticulée, comprenant au moins 30% de polyéthylène.The invention relates to a ribbed power transmission belt having an elastomer toothing based on ethylene alpha olefin elastomer. It is characterized in that the toothing and at least partly coated with a thermoplastic film at least partially crosslinked, comprising at least 30% polyethylene.
Description
COURROIE DE TRANSMISSION DE PUISSANCE. La présente invention concerne unePOWER TRANSMISSION BELT. The present invention relates to a
courroie de transmission de puissance, à savoir une courroie en V ou à nervures en forme de V, notamment de type K pour des applications automobiles. power transmission belt, namely a V-shaped belt or V-shaped rib, in particular of type K for automotive applications.
Les nervures de telles courroies, qui sont composées de caoutchouc vulcanisé ont des faces en contact direct avec la poulie de vilebrequin et avec les poulies des accessoires entraînés. Les moteurs à combustion interne présentent un phénomène d'acyclisme qui est d'autant plus important que le taux de compression est io élevé (notamment dans les moteurs Diesel) et que le nombre de cylindres est réduit. Cet acyclisme irnpose des contraintes mécaniques importantes aux courroies. Certains accessoires, par exemple un alternateur en charge présentent des inerties élevées, ce qui génère des niveaux de couples 15 dynamiques d'autant plus importants que l'acyclisme est élevé. Ces variations du niveau de couple se traduisent à leur tour par des écarts de tension de la courroie qui sont importants, voire très importants. Lorsque le niveau de tension de la courroie est trop bas, elle peut présenter un glissement instantané suffisamment important pour 20 empêcher l'entraînement et générer du bruit. La courroie doit donc présenter un coefficient de frottement suffisant pour éviter ce phénomène. Par contre, si le coefficient de frottement de la courroie est trop élevé, on peut observer un phénomène d'accrochage important dans la 25 poulie réceptrice, puis un décrochage brusque générateur de bruit ("stick-slip"). Une troisième cause possible de bruyance est le désalignement relatif de deux poulies, qui génère également un phénomène d'accrochage-décrochage ("stick-slip") générateur de bruit d'autant plus 30 important que le coefficient de frottement est important. Ce phénomène dépend également de la longueur de brin, des dimensions de la courroie, et de la nature des rnatériaux qui la composent. Pour remédier aux deux premières causes (coefficient de frottement trop bas ou trop élevé) il est connu de diminuer les variations de 35 tension par l'ajout de dispositifs tels qu'un filtre sur le vilebrequin (AVT), ou bien d'une roue libre ou d'une poulie découpleuse sur l'alternateur. The ribs of such belts, which are made of vulcanized rubber, have faces in direct contact with the crankshaft pulley and with the pulleys of the driven accessories. Internal combustion engines exhibit a phenomenon of acyclism which is all the more important as the compression ratio is high (especially in diesel engines) and the number of cylinders is reduced. This acyclism places significant mechanical stresses on the belts. Some accessories, for example an alternator in charge, have high inertia, which generates dynamic torque levels that are all the more important as the acyclism is high. These variations in the torque level are in turn reflected by belt tension deviations that are important or very important. When the belt tension level is too low, it may have instant slip sufficient to prevent the drive and generate noise. The belt must therefore have a coefficient of friction sufficient to prevent this phenomenon. On the other hand, if the coefficient of friction of the belt is too high, a significant hooking phenomenon can be observed in the receiving pulley, followed by a sudden noise-generating stall ("stick-slip"). A third possible cause of noisiness is the relative misalignment of two pulleys, which also generates a noise-generating "stick-slip" phenomenon that is all the more important as the coefficient of friction is important. This phenomenon also depends on the length of strand, the dimensions of the belt, and the nature of the materials which compose it. To remedy the first two causes (coefficient of friction too low or too high) it is known to reduce tension variations by adding devices such as a filter on the crankshaft (AVT), or a wheel free or a decoupling pulley on the alternator.
On peut également augmenter le niveau moyen de tension de la courroie, mais cette solution ne remédie que partiellement au problème. Enfin, ces solutions ne permettent pas du tout de remédier à un désalignement très important, et de résoudre le phénomène de bruit qui lui est lié. Il est donc souhaitable de trouver une solution satisfaisante pour contrôler l'adhérence entre les courroies et les poulies et qui éventuellement évite l'adjonction de dispositifs auxiliaires tels qu'un filtre sur le vilebrequin, ou bien une roue libre ou une poulie découpleuse sur lo l'alternateur. Il a été proposé dans la Demande de Brevet Français FR 2 210 251 de limiter le bruit de contact en déposant sur la denture d'une courroie un film de polyéthylène à poids moléculaire ultra élevé ou bien encore en déposant un film de polyéthylène seulement sur le haut de la 15 denture (Demande PCT WO 2004/011822) pour éviter une insuffisance de transmission de puissance à cause d'un coefficient de frottement trop faible. Dans l'un et l'autre cas, les contraintes de cisaillement et de flexion/contreflexion sont subies par le film continu, ce qui entraîne une dégradation par craquelure et fissure du film et donc une longévité 20 insuffisante du revêtement. Par ailleurs, il a été proposé d'intégrer à la denture des matériaux sous forme de charges par exemple du graphite dans le cas des Brevets US 4 024 773, US 4 031 768 ou bien encore US 4 892 510. L'intégration de ces charges est obtenu sans lien suffisant 25 avec le polymère de la denture, ce qui fait que lors d'un contact avec glissement, il y a arrachement d'éléments de charge et discontinuité du frottement caoutchouc/charge. L'arrachage de ces charges facilite les amorces de fissure et fragilise localement l'élastomère. Ainsi, les dépôts en surface proposés ne possèdent pas une 30 adhérence suffisamment forte pour garantir un coefficient de frottement suffisamment stable pendant la durée de vie de la courroie. A cause de l'abrasion, le coefficient de frottement augmente progressivement, d'où apparition progressive d'un phénomène de bruyance. La présente invention a pour objet de proposer une courroie 35 dont les performances sont améliorées en ce qui concerne le phénomène de bruyance. It is also possible to increase the average tension level of the belt, but this solution only partially remedies the problem. Finally, these solutions do not allow at all to remedy a very significant misalignment, and to solve the noise phenomenon associated with it. It is therefore desirable to find a satisfactory solution to control the adhesion between the belts and the pulleys and which possibly avoids the addition of auxiliary devices such as a filter on the crankshaft, or a freewheel or a decoupling pulley on lo the alternator. It has been proposed in French Patent Application FR 2,210,251 to limit contact noise by depositing on the toothing of a belt an ultra-high molecular weight polyethylene film or else by depositing a polyethylene film only on the top of the toothing (PCT application WO 2004/011822) to avoid insufficient power transmission because of a coefficient of friction too low. In either case, the shear and bending / counterflexing stresses are experienced by the continuous film, resulting in crack and crack degradation of the film and thus insufficient longevity of the coating. Furthermore, it has been proposed to incorporate in the toothing materials in the form of fillers for example graphite in the case of US Pat. Nos. 4,024,773, 4,031,768 or 4,892,510. The fillers are obtained without a sufficient linkage with the polymer of the toothing, so that in contact with sliding, there is tearing of the load elements and discontinuity of the rubber / load friction. Tearing these loads facilitates crack initiation and locally weakens the elastomer. Thus, the proposed surface deposits do not have sufficient adhesion to ensure a sufficiently stable coefficient of friction during the life of the belt. Because of the abrasion, the coefficient of friction increases gradually, resulting in a progressive phenomenon of noisiness. The present invention aims to provide a belt 35 whose performance is improved with respect to the noise phenomenon.
L'invention concerne ainsi une courroie nervurée de transmission de puissance présentant une denture en élastomère à base d'éthylène alpha oléfine, notamment l'EPDM ou l'EPM, caractérisée en ce que la denture est au moins en partie revêtue d'un film en une matière thermoplastique au moins en partie réticulé et contenant au moins 30% de polyéthylène, par exemple 30% et 90% de polyéthylène, notamment entre 50% et 90% de polyéthylène et plus particulièrement entre 80% et 90% de polyéthylène. En particulier le film peut comporter un mélange de polyoléfines au moins en partie réticulé, ou bien encore un copolymère à base de io polyéthylène, notamment un copolymère éthyléneoctène-polyéthylène. Le film présente une épaisseur qui est par exemple comprise entre 10 p et 500 p, et plus particulièrement entre 50 p et 200 p. Le film peut comporter des particules de noir de carbone, ce qui permet de lui conférer une conductivité suffisante pour éviter 15 l'accumulation de charges électrostatiques. Le film peut avantageusement comporter des particules et/ou des fibres de graphite, de bisulfure de molybdène et/ou de PTFE, ce qui permet d'augmenter les propriétés de glissement. La granulométrie des particules peut être comprise entre 15 p 20 et 200 , notamment entre 30 p et 100 , et plus particulièrement entre 30 p et 90 p. L'invention concerne également un procédé de fabrication d'une courroie telle que définie ci-dessus, caractérisé en ce qu'il met en oeuvre l'application d'un film en matière thermoplastique tel que défini ci- 25 dessus, à l'état non réticulé ou au moins en partie réticulé (par exemple avec un taux de réticulation de 20% ou plus). Cette application s'effectue avantageusement avant formation de la denture par moulage dans un hydromoule et vulcanisation de la courroie. Au cours de la vulcanisation de la courroie (autour de 180 C), il se 30 produit un changement de structure du film qui aboutit en particulier dans un premier cas, à une réticulation partielle du film non réticulé dans un second cas, et à une augmentation du taux de réticulation du film partiellement réticulé, à condition cependant que le film soit réticulable au cours de la vulcanisation, qui s'effectue par exemple au peroxyde. 35 En particulier, une co-réticulation est susceptible de se produire entre le film et l'élastomère de la denture de la courroie (EPDM ou EPM notamment), avec entre autres pour avantage une très bonne adhésion du film sur la denture de la courroie. La figure 1 illustre une courroie automobile de type K selon l'invention. The invention thus relates to a ribbed power transmission belt having an ethylene alpha olefin elastomer toothing, in particular EPDM or EPM, characterized in that the toothing is at least partly coated with a film in a thermoplastic material at least partially crosslinked and containing at least 30% polyethylene, for example 30% and 90% polyethylene, especially between 50% and 90% polyethylene and more particularly between 80% and 90% polyethylene. In particular, the film may comprise a mixture of at least partially crosslinked polyolefins, or else a copolymer based on polyethylene, especially an ethylene-octene-polyethylene copolymer. The film has a thickness which is for example between 10 p and 500 p, and more particularly between 50 p and 200 p. The film may include carbon black particles, which provides it with sufficient conductivity to prevent the build-up of electrostatic charges. The film may advantageously comprise particles and / or fibers of graphite, molybdenum disulfide and / or PTFE, which makes it possible to increase the sliding properties. The particle size of the particles can be between 15% and 200%, especially between 30% and 100%, and more particularly between 30% and 90%. The invention also relates to a method of manufacturing a belt as defined above, characterized in that it implements the application of a film of thermoplastic material as defined above, to the uncrosslinked or at least partially cross-linked state (for example with a degree of crosslinking of 20% or more). This application is advantageously carried out before forming the toothing by molding in a hydromould and vulcanizing the belt. During the vulcanization of the belt (around 180 ° C.), a change in the structure of the film occurs, which in particular leads in a first case to a partial crosslinking of the non-crosslinked film in a second case, and to a increasing the degree of crosslinking of the partially crosslinked film, provided however that the film is crosslinkable during vulcanization, which is carried out for example with peroxide. In particular, a co-crosslinking is likely to occur between the film and the elastomer of the teeth of the belt (EPDM or EPM in particular), with inter alia for advantage a very good adhesion of the film on the toothing of the belt. . Figure 1 illustrates a type K automotive belt according to the invention.
Les figures 2a et 2b représentent des essais de traction respectivement clans le sens d'extrusion dit "sens machine" (figure 2a) et dans le sens travers perpendiculaire au sens d'extrusion (figure 2b) pour trois films thermoplastiques à base de polyéthylène, respectivement en polyéthylène à très haute masse moléculaire (UHMW-courbe I), film à base io de polyéthylène basse densité (courbe II) et fil en polyéthylène de densité moyenne (courbe III). Selon la présente invention, on prévoit sur la surface 10 des dents 1 de courroie qui sont en un élastomère de la famille des éthylènes alpha oléfines, par exemple en EPDM ou en EPM, un revêtement constitué 15 par un film 2 en une matière thermoplastique au moins en partie réticulée, comportant au moins 50% de polyéthylène. Ce film de matière thermoplastique réticulée est posé sur la face externe de la feuille à l'état cru constituant la gomme de dent de l'ébauche. 20 L"ensemble est placé dans un hydromoule pour réaliser l'empreinte des dents et la vulcanisation de la courroie. Après démoulage, on découpe l'ébauche pour former les courroies individuelles. On constate une adhésion remarquable entre la feuille de la matière thermoplastique au moins en partie réticulée et la gomme de 25 dents vulcanisée. Le film de matière thermoplastique au moins en partie réticulé est en particulier un polyoléfine ou un mélange de polyoléfines qui est au moins en partie réticulé. Le degré de réticulation permet de contrôler les propriétés mécaniques du film et notamment d'éviter que son module d'Young 30 (qui caractérise sa raideur) ne soit trop élevé. Il est avantageux que le film soit un mélange de polyoléfines qui contient du polyéthylène, par exemple entre 50% et 90% de polyéthylène et plus particulièrement entre 80% et 90% de polyéthylène. Le polyéthylène co-réticule avec l'EPDM ou l'EPM grâce à la 35 présence de peroxyde ou autre agent de réticulation, ainsi qu'éventuellement la matrice du film, ce qui crée des liaisons avec l'éthylène alpha oléfine qui constitue la denture de la courroie et favorise l'adhérence du film à l'élastomère de la denture. D'autres part, la bonne compatibilité du polyéthylène avec la séquence éthylène contenue dans l'élastomère de la denture (par exemple EPDM) améliore l'interpénétration des deux couches. FIGS. 2a and 2b show tensile tests respectively in the extrusion direction known as "machine direction" (FIG. 2a) and in the transverse direction perpendicular to the extrusion direction (FIG. 2b) for three thermoplastic films based on polyethylene, respectively ultra high molecular weight polyethylene (UHMW-curve I), low density polyethylene film (curve II) and medium density polyethylene wire (curve III). According to the present invention, there are provided on the surface 10 belt teeth 1 which are made of an elastomer of the family of alpha olefin ethenes, for example EPDM or EPM, a coating constituted by a film 2 made of a thermoplastic less partially crosslinked, having at least 50% polyethylene. This film of crosslinked thermoplastic material is placed on the outer face of the sheet in the green state constituting the tooth gum of the blank. The assembly is placed in a hydromould to perform the impression of the teeth and the vulcanization of the belt.After demolding, the blank is cut to form the individual belts.It is noted a remarkable adhesion between the sheet of the thermoplastic material to The at least partially cross-linked thermoplastic film is in particular a polyolefin or a mixture of polyolefins which is at least partially cross-linked, the degree of crosslinking makes it possible to control the mechanical properties. of the film and in particular to prevent its Young's modulus 30 (which characterizes its stiffness) from being too high It is advantageous for the film to be a polyolefin mixture which contains polyethylene, for example between 50% and 90% of polyethylene and more particularly between 80% and 90% of polyethylene The polyethylene co-crosslinks with EPDM or EPM thanks to the presence of polyethylene. oxide or other crosslinking agent, and optionally the matrix of the film, which creates bonds with ethylene alpha olefin which is the tooth of the belt and promotes the adhesion of the film to the elastomer of the toothing. On the other hand, the good compatibility of the polyethylene with the ethylene block contained in the elastomer of the toothing (for example EPDM) improves the interpenetration of the two layers.
On choisit de préférence du polyéthylène basse densité (jusqu'à environ 0,94 g/cm3), ce qui permet de se rapprocher des caractéristiques de la gomme constituant les dents de la courroie. Le film, lorsqu'il est posé sur la feuille crue de gomme de dents, présente une épaisseur par exemple entre 10 et 500 lu, et plus io particulièrement entre 5011 et 200 . Après passage en hydromoule, et formation des dents avec vulcanisation au peroxyde de la courroie, le film subit un étirement moyen de l'ordre de 100%, ce qui fait que son épaisseur se situe entre 5 et 250 , et plus particulièrement entre 25 et 100 . Un film de 100 donne un 15 revêtement des dents dont l'épaisseur est environ 50 sur la courroie finie. Comme le montrent les figures 2a et 2b, le film à base de polyéthylène basse densité (courbe Il) ne présente pas de seuil d'écoulement dans le sens machine. La présence d'un seuil d'écoulement se traduit par une région de pente négative après le coude de la courbe. Il présente un seuil 20 d'écoulement dans le sens perpendiculaire au sens machine, mais ce seuil est moins prononcé que pour les deux autres films. Or, au cours de l'étape de vulcanisation, les propriétés du film sont modifiées, ce qui conduit à la diminution, voire à la suppression d'un seuil d'écoulement et à une diminution de la valeur du module du film (qui 25 devient plus souple). On voit donc l'intérêt du procédé utilisant un film à base de polyéthylène basse densité : supprimer le seuil d'écoulement dans le sens travers où précisément le film subit un allongement de 100% lors de la formation de dents dans l'hydromoule. La présence de ce film qui revêt les dents de la courroie 30 permet de réduire le phénomène de bruit et de conserver cet avantage dans le temps, car un tel film au moins en partie réticulé, présente une très bonne résistance à l'usure par abrasion. Il est possible d'ajouter au film thermoplastique au moins en partie réticulé un additif tel que le noir de carbone sous forme de poudre, ce 35 qui permet de conférer à la surface de la courroie une conductivité suffisante pour éviter les phénomènes d'accumulation de charges électrostatiques. Preferably low density polyethylene (up to about 0.94 g / cm 3) is chosen, which makes it possible to approach the characteristics of the gum constituting the teeth of the belt. The film, when placed on the raw toothbrush sheet, has a thickness for example between 10 and 500 lbs, and more particularly between 5011 and 200. After hydromoulding, and forming the teeth with peroxide vulcanization of the belt, the film undergoes a medium stretch of the order of 100%, so that its thickness is between 5 and 250, and more particularly between 25 and 100. A film of 100 gives a coating of the teeth whose thickness is about 50 on the finished belt. As shown in FIGS. 2a and 2b, the low-density polyethylene-based film (curve II) does not show a flow threshold in the machine direction. The presence of a flow threshold results in a region of negative slope after the bend of the curve. It has a flow threshold in the direction perpendicular to the machine direction, but this threshold is less pronounced than for the other two films. However, during the vulcanization step, the properties of the film are modified, which leads to the reduction or even the suppression of a flow threshold and a decrease in the value of the film module (which becomes more flexible). We therefore see the advantage of the process using a low density polyethylene film: suppress the flow threshold in the cross direction where the film undergoes a 100% elongation during the formation of teeth in the hydromoule. The presence of this film which coats the teeth of the belt 30 makes it possible to reduce the noise phenomenon and to preserve this advantage over time, since such an at least partly cross-linked film has a very good resistance to abrasion wear. . It is possible to add to the at least partially cross-linked thermoplastic film an additive such as carbon black in the form of powder, which makes it possible to give the surface of the belt sufficient conductivity to avoid the phenomena of accumulation of electrostatic charges.
Le coefficient de glissement de la courroie peut être également amélioré en incorporant au film des particules et/ou des fibres de graphite, de bisulfure de molybdène et/ou de PTFE, ce qui est favorable à la diminution du bruit. The sliding coefficient of the belt can also be improved by incorporating particles and / or fibers of graphite, molybdenum disulfide and / or PTFE into the film, which is favorable to the reduction of the noise.
Le film thermoplastique au moins en partie réticulé présente en général de bonnes propriétés en présence d'hydrocarbures. Les résines thermoplastiques réticulables comportent un ou plusieurs polymères tels que des polyoléfines, les polystyrènes, les polyuréthanes, les polyamides et les polyesters. io Pour une courroie en EPDM ou en EPM, il est particulièrement avantageux d'utiliser un film réticulé en un polyoléfine contenant un homo ou un copolymère comprenant de l'éthylène. Les copolymères d'éthylène comprennent notamment les copolymères éthylène/alpha-oléfine ("EAO"), les copolymères éthylène/ester non saturé, 15 les copolymères éthylène/acrylate/acide acrylique, les copolymères éthylène/acide méthacrylique et les copolymères polyéthylèneéthyléneoctène. On notera que le terme copolymère recouvre les polymères issus de deux types de monomères ou plus, et inclut donc les terpolymères. Il existe différents procédés de réticulation utilisables pour le 20 film : 1) la réticulation chimique qui met en oeuvre un ou plusieurs agents de réticulation (peroxyde, silane ...), ainsi qu'une exposition à au moins une condition d'activation (chaleur, pression, et/ou radiations). La réticulation chimique est par exemple réalisée à l'aide de 25 péroxyde, entre 110 C et 220 C, notamment pour le polyéthylène et le TPE tel que SBS ou SIS, ou bien encore pour le polyéthylène chloré (CM ou CPE), ou le polyéthylène chlorosulfoné (CSM). Pour augmenter le degré de réticulation, il est possible d'ajouter au mélange utilisé pour le film des co-agents de réticulation 30 comprenant notamment des groupements acrylate (acrylate difonctionnel DA, acrylate trifonctionnel TA), méthacrylate (méthacrylate difonctionnel DMA, ou trifonctionnel TMA, triméthyol propane triméthacrylate TMPTMA), cyanurate (triallyl isocyanurate TAIC) ou bien encore PB (1,2-vinylpolybutadiene) ou mPDM (N,N'-m-phénylenedimaléimide). 35 2) la réticulation par radiations (faisceau d'électrons, rayons X, rayons gamma ou beta) pouvant ou non mettre en oeuvre des co-agents de réticulation. Pour les électrons, l'énergie est de préférence au moins égale à 104 eV. Pour une réticulation par irradiation, on utilise par exemple une dose entre 10 kGray et 300 kGray à une température entre 0 C et 60 C 5 et de préférence à température ambiante (20 C). Le degré de réticulation peut être déterminé notamment en mesurant le contenu de gel ("gel content") par exemple selon la norme ASTMD 2765-95. Un autre test pour déterminer le contenu de gel (en %) io consiste à dissoudre la fraction non réticulée dans un solvant qui ne dissout pas la fraction réticulée ("gel") de la résine. Le pourcentage obtenu est la fraction de la phase insoluble (réticulée) rapportée à la masse totale de la résine. Une autre méthode est de déterminer l'indice de fluage ("melt 15 flow index") selon la norme ASTMD 1238-98. The at least partially crosslinked thermoplastic film generally has good properties in the presence of hydrocarbons. The crosslinkable thermoplastic resins comprise one or more polymers such as polyolefins, polystyrenes, polyurethanes, polyamides and polyesters. For an EPDM or EPM belt, it is particularly advantageous to use a crosslinked film of a polyolefin containing a homo or copolymer comprising ethylene. Ethylene copolymers include, but are not limited to, ethylene / alpha-olefin copolymers ("EAO"), ethylene / unsaturated ester copolymers, ethylene / acrylate / acrylic acid copolymers, ethylene / methacrylic acid copolymers, and polyethyleneethylenecocene copolymers. It should be noted that the term "copolymer" covers polymers derived from two or more types of monomer, and therefore includes terpolymers. There are various crosslinking processes that can be used for the film: 1) chemical crosslinking which uses one or more crosslinking agents (peroxide, silane, etc.), as well as exposure to at least one activation condition ( heat, pressure, and / or radiation). The chemical crosslinking is for example carried out using peroxide, between 110 ° C. and 220 ° C., in particular for polyethylene and TPE such as SBS or SIS, or else for chlorinated polyethylene (CM or CPE), or chlorosulfonated polyethylene (CSM). To increase the degree of crosslinking, it is possible to add to the mixture used for the film co-crosslinking agents 30 comprising in particular acrylate groups (difunctional acrylate DA, trifunctional acrylate TA), methacrylate (difunctional methacrylate DMA, or trifunctional TMA trimethyol propane trimethacrylate TMPTMA), cyanurate (triallyl isocyanurate TAIC) or alternatively PB (1,2-vinylpolybutadiene) or mPDM (N, N'-m-phenylenedimaléimide). 2) the crosslinking by radiation (electron beam, X-ray, gamma or beta radiation) which may or may not employ co-crosslinking agents. For electrons, the energy is preferably at least 104 eV. For irradiation cross-linking, for example, a dose between 10 kGray and 300 kGray is used at a temperature between 0 ° C and 60 ° C and preferably at room temperature (20 ° C). The degree of crosslinking can be determined in particular by measuring the content of gel ("gel content") for example according to ASTMD 2765-95. Another test for determining the gel content (in%) is to dissolve the uncrosslinked fraction in a solvent that does not dissolve the crosslinked ("gel") fraction of the resin. The percentage obtained is the fraction of the insoluble (crosslinked) phase relative to the total mass of the resin. Another method is to determine the melt flow index according to ASTM 1238-98.
ESSAIS COMPARATIFS Type Essai Conditions Caractéris- courroie courroie courroie (Norme) tique mesurée EPDM avec film avec film standard PE UHMW PE selon flockée l'invention Moteur moteur 4cyl. durée de vie 800 65 1200 Diesel diesel, (h) craquelure accessoires débitants, ralenti Tenue 121 C / 20Nm durée de vie 600 910 920 chaleur / K6 (h) (SAE J2432A) Qualifica-25 C / 50% Angle ( ) 2 4,5 4,5 tion bruit HR d'apparition (SAE de la J2432A) bruyance La courroie EPDM avec film PE selon l'invention testée comporte un film plastomère copolymère polyéthylène-éthyléneoctène. L'angle mesuré selon SAE J2432A est un angle de désalignement exprimé en . C'est l'angle qui a pour tangente le rapport entre le désalignement axial a (en mm) entre poulies et la longueur L du brin non désaligné. Angle = Arctg (a/L) L'essai consiste à appliquer un désalignement axial et d'écouter à partir de quel désalignement la bruyance apparaît. Plus l'angle est Io grand, meilleur est le résultat. Exemple : longueur de brin L non désalignée entre deux poulies d'essai : 80 mm ; désalignement axial (a) provoqué pour atteindre l'apparition de la bruyance = 6,3 mm ; Angle = Arctg (6,3/80) = 4,5 . COMPARATIVE TESTS Type Test Conditions Belt belt belt (Standard) measured EPDM with film with standard PE film UHMW PE according to flocked invention Motor 4cyl. service life 800 65 1200 Diesel diesel, (h) cracking flow accessories, idle Holding 121 C / 20Nm service life 600 910 920 heat / K6 (h) (SAE J2432A) Qualifica-25 C / 50% Angle () 2 4 The noise rate of the EPDM belt with PE film according to the invention tested comprises a polyethylene-ethylene-octene copolymer plastomer film. The angle measured according to SAE J2432A is an angle of misalignment expressed in. It is the angle that has the tangential relationship between the axial misalignment a (in mm) between pulleys and the length L of the non-misaligned strand. Angle = Arctg (a / L) The test consists in applying axial misalignment and listening from which misalignment loudness appears. The bigger the angle is Io, the better the result. Example: length of strand L not misaligned between two test pulleys: 80 mm; axial misalignment (a) caused to reach the appearance of noisiness = 6.3 mm; Angle = Arctg (6.3 / 80) = 4.5.
Claims (10)
Priority Applications (8)
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FR0601923A FR2898171B1 (en) | 2006-03-03 | 2006-03-03 | POWER TRANSMISSION BELT. |
US11/576,737 US8262522B2 (en) | 2006-03-03 | 2007-03-01 | Power transmission belt |
BRPI0708532-0A BRPI0708532B1 (en) | 2006-03-03 | 2007-03-01 | POWER TRANSMISSION BELT |
KR1020087023970A KR20080111462A (en) | 2006-03-03 | 2007-03-01 | Power transmission belt |
EP07731068A EP1996831B1 (en) | 2006-03-03 | 2007-03-01 | Power transmission belt and method for producing said power transmission belt |
ES07731068T ES2402421T3 (en) | 2006-03-03 | 2007-03-01 | Power transmission belt and manufacturing procedure |
JP2008556818A JP5191400B2 (en) | 2006-03-03 | 2007-03-01 | Transmission belt |
PCT/FR2007/000368 WO2007099233A2 (en) | 2006-03-03 | 2007-03-01 | Power transmission belt |
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FR0601923A FR2898171B1 (en) | 2006-03-03 | 2006-03-03 | POWER TRANSMISSION BELT. |
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FR2898171B1 FR2898171B1 (en) | 2009-02-27 |
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FR0601923A Active FR2898171B1 (en) | 2006-03-03 | 2006-03-03 | POWER TRANSMISSION BELT. |
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WO2009109434A1 (en) * | 2008-03-01 | 2009-09-11 | Contitech Antriebssysteme Gmbh | Elastic item, in particular drive belt, comprising a film protecting layer and method for the manufacture thereof |
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FR2923494B1 (en) * | 2007-11-09 | 2010-01-15 | Hutchinson | IMPER-BREATHING MEMBRANES AND METHOD FOR THE PRODUCTION THEREOF |
FR2936291B1 (en) | 2008-09-23 | 2011-06-03 | Hutchinson | POWER TRANSMISSION BELT. |
DE102011002274A1 (en) | 2011-04-27 | 2012-10-31 | Contitech Antriebssysteme Gmbh | Elastic article, in particular drive belt, with a coating in the form of a fleece of a fusible plastic |
DE102011050483A1 (en) | 2011-05-19 | 2012-11-22 | Contitech Antriebssysteme Gmbh | Drive belt with a reinforcing band or a reinforcing braid or with zone-wise arranged reinforcing elements within the substructure |
JP5926543B2 (en) * | 2011-11-25 | 2016-05-25 | 三ツ星ベルト株式会社 | Friction transmission belt and manufacturing method thereof |
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2006
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2007
- 2007-03-01 ES ES07731068T patent/ES2402421T3/en active Active
- 2007-03-01 EP EP07731068A patent/EP1996831B1/en active Active
- 2007-03-01 US US11/576,737 patent/US8262522B2/en active Active
- 2007-03-01 JP JP2008556818A patent/JP5191400B2/en active Active
- 2007-03-01 BR BRPI0708532-0A patent/BRPI0708532B1/en active IP Right Grant
- 2007-03-01 KR KR1020087023970A patent/KR20080111462A/en not_active Application Discontinuation
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WO2009109434A1 (en) * | 2008-03-01 | 2009-09-11 | Contitech Antriebssysteme Gmbh | Elastic item, in particular drive belt, comprising a film protecting layer and method for the manufacture thereof |
WO2014056892A1 (en) | 2012-10-08 | 2014-04-17 | Hutchinson | Power transmission belt with thermoplastic film containing a silicone elastomer |
US9568070B2 (en) | 2012-10-08 | 2017-02-14 | Hutchinson | Power transmission belt with thermoplastic film containing a silicone elastomer |
WO2017060460A1 (en) | 2015-10-09 | 2017-04-13 | Hutchinson | Power transmission belt with thermoplastic film comprising a silicone elastomer and carbon nanotubes |
Also Published As
Publication number | Publication date |
---|---|
US8262522B2 (en) | 2012-09-11 |
JP5191400B2 (en) | 2013-05-08 |
US20080207371A1 (en) | 2008-08-28 |
WO2007099233A3 (en) | 2007-10-18 |
EP1996831B1 (en) | 2013-01-16 |
WO2007099233A2 (en) | 2007-09-07 |
KR20080111462A (en) | 2008-12-23 |
JP2009533606A (en) | 2009-09-17 |
ES2402421T3 (en) | 2013-05-03 |
FR2898171B1 (en) | 2009-02-27 |
BRPI0708532B1 (en) | 2019-03-19 |
EP1996831A2 (en) | 2008-12-03 |
BRPI0708532A2 (en) | 2011-05-31 |
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